For number n = 1, 2, 3, 4 creates a point at the corner of the Graphics View, for n = 5 returns point (w, h), where w and h are width and height of the Graphics View in pixels. Always uses first Graphics View, even if second is active.

Note: use -1 for the 3D Graphics View's corners (available values for Number: from 1 to 8); for n = 9 returns point (w, h, 0), where w and h are width and height of the Graphics View in pixels; for n = 10 returns point (w, h, 0), where w and h are width and height of the main window in pixels; for n = 11 returns view direction (for parallel projections) or eye position (for e.g. perspective projection).

Corner( <Image>, <Number of Corner> )

Creates a point at the corner of the image (number n = 1, 2, 3, 4).

Corner( <Text>, <Number of Corner> )

Creates a point at the corner of the text (number n = 1, 2, 3, 4).

Note: Corner( <Text>, <Number of Corner> ) won't work inside the Sequence or Zip commands. Also the Absolute Position on Screen property must be unchecked

Note: The numbering of the corners is counter‐clockwise and starts at the lower left corner.

Comments

Sometimes you might have trouble finding some objects when you open your GeoGebra file on an different computer. The reason is usually that the resolution of the display is different from the one of your home computer. But there are some possibilities to avoid disappearing objects:

Place the objects close to the upper left corner. As this corner is saved in the file for the position of the visible graphic-area, the objects should be always visible.

Use the Corner command to calculate the position of an object relative to the corners of the Graphics View. For more information look at this brief tutorial.